What differentiates extension from hyperextension? a. extension bends joints in the opposite direction as hyperextension. b. extension straightens a joint, and hyperextension bends it but in the opposite direction from flexion. c. hyperextension straightens a joint, and extension bends it in the opposite direction from flexion. d. both bend joints, but extension can be damaging.

B. Extension straightens a joint, and hyperextension bends it but in the opposite direction from flexion.

Explanation:

Stretching and overexertion are terms that refer to body movements. Extension refers to movement in the sagittal plane, in which two body segments (proximal and distal) move away from each other, at which point a joint is straightened. Hyperextension, on the other hand, occurs when the extension movement exceeds the anatomical position, or beyond its normal capacity, at which point a joint is bent in the opposite direction to flexion.

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